ng : File C:\Program Files\nodejs\ng.ps1 cannot be loaded because running scripts is disabled on this system.

I found out here that you can add to your visual studio code settings the following and the problem will vanish: For visual studio code settings, go to File -> Preferences -> Settings -> Extensions -> Scroll down and find "Edit in settings.json"

"terminal.integrated.shellArgs.windows": ["-ExecutionPolicy", "Bypass"]
The reason is that, in build command line integrations like visual studio code, you need to set the command line policies by your self. By setting the above configurations, the visual studio code will do that for you.

(read this to understand better the command line policies)

Set-ExecutionPolicy -Scope "CurrentUser" -ExecutionPolicy "RemoteSigned"

Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser

Run this command on your VScode integrated terminal: 
Set-ExecutionPolicy -ExecutionPolicy Unrestricted